To get started on Mac OS X with your own local sandbox, you will want to
install the Homebrew package manager using directions from its website. It
will allow you to install all of the software mentioned previously by launching
Terminal and typing

I highly recommend installing Git through Homebrew, as well, but it isn’t
required. I prefer Apache’s official CouchDB.app and Heroku’s Postgres.app
over the distributions installed by Homebrew because they include convenient
launchers that live in the menu bar.

A Ruby implementation of QM is also available in the project repository, and
its directions are similar to those for Node.js. If you don’t already use RVM,
you should – it’s fantastic and highly recommended.